Answer

Yes.  The unD4I-L will pass regulated 24V DC power to the PWR Link output connector when powered via PoE, DC barrel jack input or the 24V PWR Link input.

The amount of power available at the this output is limited by the PoE PSE (switch or midspan injector) with a a maximum of 15.4W.  Typically the unD4I-L draws less than 6W of power. However, this also depends on any phantom powered microphones or loads connected to the logic outputs. Whatever power that is not used by the unD4I-L from the maximum the switch can supply will be available through the PWR link connector.

It is recommended that an inline PoE power meter or inspection of the PoE status and power draw reported by the switch by used to determine the actual PoE load seen by the power sourcing equipment, in order to determine the available power remaining for peripheral products connected to the PWR Link DC output.